Low-temperature performance of LiFePO4/C cathode in a quaternary carbonate-based electrolyte

被引：221

作者：

Liao, Xiao-Zhen ^{[1
]}

Ma, Zi-Feng ^{[1
]}

Gong, Qiang ^{[1
]}

He, Yu-Shi ^{[1
]}

Pei, Li ^{[1
]}

Zeng, Ling-Jie ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Dept Chem Engn, Shanghai 200240, Peoples R China

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2008年 / 10卷 / 05期

基金：

上海市自然科学基金; 中国国家自然科学基金;

关键词：

low-temperature performance; LiFePO4/C cathode; quaternary carbonate-based electrolyte; lithium ion batteries;

D O I：

10.1016/j.elecom.2008.02.017

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The low-temperature performance of LiFePO4/C cathode in a quaternary carbonate-based electrolyte (1.0 M LiPF6/EC+DMC+DEC+EMC (1: 1: 1:3, v/v)) was studied. The discharge capacities of the LiFePO4/C cathode were about 134.5 mAh/g (20 degrees C), 114 mAh/g (0 degrees C), 90 mAh/g (-20 degrees C) and 69 mAh/g (-40 degrees C) using a 1C charge-discharge rate. Cyclic voltammetry measurements show obviously sluggish of the lithium insertion-extraction process of the LiFePO4/C cathode as the operation temperature falls below -20 degrees C. Electrochemical impedance analyses demonstrate that the sluggish of charge-transfer reaction on the electrolyte/LiFePO4/C interface and the decrease of lithium diffusion capability in the bulk LiFePO4 was the main performance limiting factors at low-temperature. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：691 / 694

页数：4

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